Fabrication of silicon doped hematite photoelectrode with enhanced photocurrent density via solution processing of an in-situ TEOS modified precursor

Bora, Debajeet K.

doi:10.1016/j.mssp.2014.11.026

Cited by 10 publications

(3 citation statements)

References 32 publications

(42 reference statements)

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“…These characteristics could be improved by adding suitable dopants to hematite. When tetravalent dopants, such as Ti, Zr, Sn, Mn, Ge and Si are added to replace some of the Fe 3+ cations, the extra electrons donated to the crystal will increase its conducting electron concentration and retain its n-type conductivity [24,47,[56][57][58]. When divalent dopants, such as Mg, Cu and Ni are added to replace Fe 3+ cations in the crystal, hole carriers are created making the hematite p-type [59][60][61].…”

Section: Strategies To Overcome Bulk Property Limitations Of Hematitementioning

confidence: 99%

Recent progress in iron oxide based photoanodes for solar water splitting

Gurudayal

Bassi

Sritharan

et al. 2018

J. Phys. D: Appl. Phys.

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Solar assisted water splitting in a PEC is an attractive concept to store solar energy as hydrogen fuel but the effective efficiency of the process is too low for it to be a serious contender for commercialization. The most important component of the PEC to achieve efficient water splitting is a photo active anode that could effectively absorb photons and deliver holes for the oxygen evolution reaction. Hematite has many attributes that make it a good candidate material for a photoanode but it also has some deficiencies. This article reviews the state-of-the-art hematite-based photoanodes, with special emphasis on attempts made by researchers to overcome its drawbacks. The numerous research reports are categorized under distinct strategies such as nanostructuring, elemental doping, surface passivation, cocatalyst application, conducting template incorporation and heterostructures which are possible pathways to improve the performance of hematite. The scientific understandings of the operating mechanisms for each strategy are systematically presented and discussed, and the improvements achieved by different approaches are compared. Some cutting-edge strategies, such as heterojunctions, could be important and hematite based heterostructures are discussed. A developing interest in an emerging material, Fe 2 TiO 5 is also discussed and some of the important benefits of this material are presented. Finally, the importance of scaling up the technology is discussed and attention is drawn to some possible challenges on scaling up. The paper concludes with some future technology directions and prospects for hematite-based photoanodes.

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Section: Strategies To Overcome Bulk Property Limitations Of Hematitementioning

confidence: 99%

Recent progress in iron oxide based photoanodes for solar water splitting

Gurudayal

Bassi

Sritharan

et al. 2018

J. Phys. D: Appl. Phys.

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“…Ti-modified Hematite Photoanodes Preparation: The photoanode fabrication and structural characterization were made by adapting and combining various previously reported synthetic approaches. [41,42] Ti (IV)-modified nanostructured hematite photoanodes (Ti:Fe 2 O 3 ) were prepared on a fluorine-doped SnO 2 (FTO) conductive glass by a hydrothermal approach. Briefly, the FTO glass was cleaned through ultrasonication in isopropanol and then rinsed with deionized water.…”

Section: Methodsmentioning

confidence: 99%

“…The dip coating solution was prepared following the procedure described by D. K. Bora. [41] The Fe(III) oleate layer was converted into hematite following a 30 min heat treatment at 500 °C. Solvothermal synthesis was carried out in a teflon-lined stainless steel autoclave by using an aqueous precursor containing 0.91 M sodium nitrate (NaNO 3 , Carlo Erba Reagents), at a pH value of 1.5 adjusted with 6 M HCl, 0.136 M of ferric chloride (FeCl 3 •6 H2O, Alfa Aesar), 2.5 mM Ti 2 CN (Sigma-Aldrich), and a 5% v/v ethanol (Carlo Erba Reagents).…”

Section: Methodsmentioning

confidence: 99%

Photoelectrochemical Valorization of Biomass Derivatives with Hematite Photoanodes Modified by Cocatalysts

et al. 2023

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The solar‐driven oxidation of biomass to valuable chemicals is rising as a promising anodic reaction in photoelectrochemical cells, replacing the sluggish oxygen evolution reaction and improving the added value of the energy conversion process. Herein, the photooxidation of 5‐hydroxymethylfurfural into furan dicarboxylic acid (FDCA) is performed in basic aqueous environment (borate buffer, pH 9.2), with the addition of 2,2,6,6‐tetramethylpiperidine‐1‐oxyl (TEMPO) as redox mediator. Because of its good stability, cost‐effectiveness, and nontoxicity, titanium‐modified hematite (Ti:Fe2O3) photoanodes are investigated to this aim, and their performance is tuned by engineering the semiconductor surface with a thin layer of Co‐based cocatalysts, i.e., cobalt iron oxide (CoFeO x ) and cobalt phosphate (CoPi). Interestingly, the electrode modified with CoPi shows improved efficiency and selectivity toward the final product FDCA The source of this enhancement is correlated to the effect of the cocatalyst on the charge carrier dynamics, which is investigated by electrochemical impedance spectroscopy and intensity‐modulated photocurrent spectroscopy analysis. In addition, the results of the latter are interpreted through a novel approach called Lasso distribution of relaxation time, revealing that CoPi cocatalyst is effective in the suppression of the recombination processes and in the enhancement of direct hole transfer to TEMPO.

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Key Strategies to Advance the Photoelectrochemical Water Splitting Performance of α‐Fe₂O₃ Photoanode

2018

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The last few decades’ extensive research on the photoelectrochemical (PEC) water splitting has projected it as a promising approach to meet the steadily growing demand for cleaner and renewable energy in a sustainable and economically viable fashion. Among many potential photocatalysts, hematite (α‐Fe2O3) emerges as a highly promising photoanode material with favorable characteristics including visible light absorption (a suitable band gap energy), earth abundance, chemical stability, and low cost. A pronounced disadvantage of α‐Fe2O3 is its low photovoltage together with an extremely short hole diffusion length and a low electrical conductivity, which limit its PEC water oxidation performance. To make α‐Fe2O3 as a viable photocatalyst for PEC water splitting, one needs to rectify these unfavorable characteristics of α‐Fe2O3 by elaborated multiple modifications. In this review article, we introduce various modification strategies of hematite with emphasis on surface modifications to achieve low onset potential as well as high photocurrent approaching the theoretical value for solar water splitting.

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Fabrication of silicon doped hematite photoelectrode with enhanced photocurrent density via solution processing of an in-situ TEOS modified precursor

Cited by 10 publications

References 32 publications

Recent progress in iron oxide based photoanodes for solar water splitting

Recent progress in iron oxide based photoanodes for solar water splitting

Photoelectrochemical Valorization of Biomass Derivatives with Hematite Photoanodes Modified by Cocatalysts

Key Strategies to Advance the Photoelectrochemical Water Splitting Performance of α‐Fe₂O₃ Photoanode

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Fabrication of silicon doped hematite photoelectrode with enhanced photocurrent density via solution processing of an in-situ TEOS modified precursor

Cited by 10 publications

References 32 publications

Recent progress in iron oxide based photoanodes for solar water splitting

Recent progress in iron oxide based photoanodes for solar water splitting

Photoelectrochemical Valorization of Biomass Derivatives with Hematite Photoanodes Modified by Cocatalysts

Key Strategies to Advance the Photoelectrochemical Water Splitting Performance of α‐Fe2O3 Photoanode

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Key Strategies to Advance the Photoelectrochemical Water Splitting Performance of α‐Fe₂O₃ Photoanode